Building Permit Not Required in Los Angeles: Sheds, Fences, Decks

In Los Angeles, a building permit is not required for a specific set of small, cosmetic, or non-structural projects listed in Los Angeles Municipal Code Section 91.106.2. The exempt list includes small detached sheds, most non-masonry fences, low decks and walkways, painting and interior finish work, and a handful of other minor items. It is narrower than most homeowners assume, and one of the most common misreadings—that any fence under a certain height is exempt—can lead you to build a concrete wall that actually needed a permit all along.

Detached Sheds and Small Accessory Structures

You can build a one-story detached accessory structure like a tool shed, storage building, or playhouse without a permit, provided the floor area does not exceed 120 square feet. The structure cannot sit in Fire District No. 1 (roughly downtown Los Angeles and the surrounding dense commercial areas), and it cannot contain any heating, plumbing, or electrical installation.¹

Running power or water to the shed is a separate question. The shed itself may be exempt, but the electrical or plumbing work needs its own trade permit. And the 120-square-foot exemption does not cover habitable space, so a backyard ADU or garage conversion always requires permits regardless of size.

Fences and Walls

Fence rules are where people get caught out, because the threshold depends on what the fence is made of. Non-masonry fences—wood, vinyl, chain link, wrought iron—are exempt from a building permit up to 10 feet in height. Masonry or concrete fences are exempt only if they are 3½ feet or shorter.²

A 6-foot concrete block wall as a backyard boundary is extremely common in Los Angeles, and it needs a permit. If you are pouring concrete or laying block above 3½ feet, plan on pulling one.

Even where a fence is exempt from the building permit, zoning setback and height rules still apply and may be stricter than the building code exemption. Confirm with LADBS or City Planning before assuming a fence is fully in the clear.

Low Platforms, Walkways, Driveways, and Decks

Platforms, walks, and driveways sitting no more than 30 inches above the surrounding grade are exempt, as long as they are not built over any basement or story below.² A ground-level patio or a low deck fits within this exemption. Once the surface rises above 30 inches, which happens fast on a sloped lot, a permit is required.

Painting, Wallpapering, and Cosmetic Interior Work

Painting, papering, and similar cosmetic work do not require a building permit.² The same logic extends to interior finish work such as tiling, installing cabinets, replacing countertops, and laying carpet, provided you are not altering the structure, rerouting plumbing, or adding electrical circuits. Swapping a faucet or a light switch cover is cosmetic. Moving the sink to the other side of the kitchen is not.

Other Exempt Projects

Several additional categories are exempt under LAMC 91.106.2:²

Freestanding flagpoles up to 15 feet, TV antenna towers up to 45 feet, and light standards up to 30 feet, none mounted on a building.
Swimming, bathing, or wading pools no deeper than 24 inches with a surface area of 250 square feet or less.
Residential awnings extending no more than 4 feet from the exterior wall, outside Fire District No. 1.
Outdoor tents and exhibit booths used for 30 days or less, with height limits of 12 feet.
Work performed under the control of the federal government, the State of California, or Los Angeles County.

Projects Homeowners Wrongly Assume Are Exempt

The exemption list is shorter than most people expect. Common projects that still require a permit include:

Any structural change, including removing or modifying a load-bearing wall, adding a room, or changing the roofline.
Electrical and plumbing work beyond simple like-for-like repair. Adding a new circuit, relocating a water heater, or running gas lines needs the appropriate trade permit.
Accessory dwelling units and garage conversions. The 120-square-foot shed exemption does not cover habitable space.
Masonry or concrete fences over 3½ feet.
Decks and raised platforms over 30 inches, which are routine on hillside lots.
Retaining walls holding back more than 4 feet of earth, measured from the bottom of the footing to the top of the wall, particularly where they support additional load above.

When it is genuinely unclear, treat the project as requiring a permit. Pulling one up front is cheaper than what follows if you do not.

What It Costs to Skip a Required Permit

Los Angeles enforces unpermitted work through a stacked set of fees and penalties. According to a 2020 LADBS enforcement report to the City Council:

When you need a permit to bring unpermitted work into compliance, the permit fee is doubled, with a minimum investigation fee of $400.³
A code violation inspection fee of $356.16 applies when LADBS issues an Order to Comply.³
An additional non-compliance fee of $660 applies if you do not comply within 15 days after the compliance deadline.³
Building code violations are misdemeanors under LAMC Section 11.00(m), carrying fines up to $1,000, up to six months in county jail, or both.³
Demolishing or relocating a structure without a permit can trigger a five-year moratorium on new permits for the site.³

In practice, LADBS usually discovers unpermitted work through a complaint investigation, or later, when you or a future buyer pull permits for something else. At that point you are paying double for the original permit, plus inspection fees, plus potentially tearing out and redoing work that fails inspection.

Selling and Insurance Consequences

Unpermitted work creates problems that outlast the project. Under California Civil Code Section 1102.6h, sellers of single-family residential properties must disclose any room additions, structural modifications, and other alterations, along with the name and contact information of the contractor who performed the work. If a permit was obtained, the seller must provide a copy to the buyer.⁴ Missing permits for work that clearly required one can reduce a sale price, delay escrow, or kill a deal.

Insurance is the other exposure. If unpermitted electrical work causes a fire, or an unpermitted deck fails, the insurer may deny the claim on the ground that the work was never inspected and the loss traces to construction that inspection should have caught. You then absorb the property damage and any liability to injured people.

Confirming Before You Build

The Los Angeles Department of Building and Safety is the authority on permit requirements inside the City of Los Angeles. You can reach LADBS by calling 311 from within the city or (213) 473-3231 from outside city limits.⁵ Straightforward projects can go through the online express system at PermitLA.⁶

A building permit exemption does not override other rules. Zoning ordinances can restrict where you build, how tall the structure can be, and how far it must sit from the property line. Hillside areas, coastal zones, and historic districts add review layers that apply whether or not the building code requires a permit. HOA rules, where they apply, operate independently of city permits. A quick call to LADBS before you start is free, and it is the single best guard against a project that looks exempt but is not.

1
City of Los Angeles. Los Angeles Municipal Code Ordinance No. 184271 – Accessory Structure Exemption
2
American Legal Publishing. Los Angeles Municipal Code Section 91.106 – Permits
3
City of Los Angeles. LADBS Report on Penalties Imposed for Unpermitted Construction
4
California Legislative Information. California Code, Civil Code – CIV 1102.6h
5
LADBS. Contact Us – LADBS
6
LADBS. Express Permit – PermitLA